Underground Gate Valve
Products Overview
Our Flanged Underground Gate Valve is specifically engineered for subterranean installations where space-saving and long-term reliability are paramount. Designed to handle potable water, irrigation, and wastewater systems, this valve eliminates the need for expensive valve pits.
With a robust ductile iron body and a fully encapsulated resilient wedge, it provides a 100% bubble-tight seal. The extended stem design, compatible with standard operating keys and extension spindles, ensures easy surface-level operation. When your project demands a "fit and forget" solution for underground piping, our gate valve delivers industry-leading durability and performance.
Key Features & Advantages
1. Superior Corrosion Protection
Since underground valves are exposed to soil moisture and potential chemical aggression, our valves feature an internal and external fusion-bonded epoxy (FBE) coating (minimum 250 microns). This protective barrier prevents rust and tuberculation, significantly extending the service life beyond 30 years in harsh soil conditions.
2. Resilient Seated Technology
The wedge is constructed from high-grade ductile iron and fully encapsulated in EPDM or NBR rubber. This ensures:
Low operating torque.
Zero leakage even at low pressure.
Excellent memory effect (the rubber returns to its original shape after compression).
No debris pockets at the bottom of the valve, ensuring an unobstructed flow path.
3. Maintenance-Free Stem Sealing
Equipped with a triple O-ring stem seal system, our underground gate valve is designed to prevent external leakage without the need for periodic packing adjustments. The seals can be replaced under full working pressure if necessary, although they are designed to last the life of the valve.
4. Optimized for Underground Operation
Non-Rising Stem (NRS) Design: Ideal for buried applications where vertical space is limited.
Operating Nut: Comes standard with a 2" (50mm) square operating nut.
Extension Spindle Compatible: Easily integrates with adjustable extension stems and surface boxes for ground-level access.
Technical Specifications
| Feature | Specification | |||
| Size Range | DN50-DN300(2''-12'') | |||
| Pressure Rating | PN10,PN16,PN25 | |||
| Body Material | Ductile Iron GGG40/GGG50 | |||
| Wedge Material | Ductile Iron +EPDM/NBR Encapsulation | |||
| Stem Material | Stainless Steel 2R13/304 | |||
| Connection Type | Flanged(End-to-End according to ANSI/BS/GB Standard) | |||
| Application Temp | -10℃ to 80℃ | |||
Applications
This flanged underground gate valve is the preferred choice for:
Municipal Infrastructure: Main water distribution lines and trunk mains.
Wastewater Treatment: Buried sewage isolation lines.
Industrial Cooling: Sub-surface cooling water loops for power plants and factories.
Irrigation Systems: Large-scale agricultural water transport where surface obstructions must be minimized.
Fire Protection Reservoirs: Buried suction lines for static water supplies.
Installation & Maintenance Tips
1.Alignment: Ensure the flanged faces are perfectly aligned before tightening bolts to prevent stress on the valve body.
2.Backfilling: When installing underground, ensure the soil around the valve is compacted properly. Use a valve box or surface box to protect the operating nut from direct contact with debris.
3.Operation: It is recommended to "exercise" the valve (fully open and close) at least once a year to ensure the internal components remain free of mineral buildup.
4.Flange Gaskets: Always use new, high-quality gaskets compatible with the fluid medium to ensure a leak-proof connection.
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